合併JSON數據的問題 - ObjectMapper（HashMap）

Question

我有一個包含字典的JSON文件。對於每個英文單詞都有一個與之相關的對象。每個對象都是標籤和鍵的列表。一些樣本數據：

}, 
"On": { 
    "ADP": 345, 
    "PRT": 1 
}, 
"On-to-Spokane": { 
    "ADJ": 1 
}, 
"Once": { 
    "ADP": 28, 
    "ADV": 57 
}, 
"One": { 
    "NOUN": 76, 
    "NUM": 343 
}, 

我想創建一個新的JSON文件在我去的每個字在已有的詞集，並取詞的結尾。如果結尾的單詞已經存在於新地圖中，並且已經存在於新地圖中，則該單詞中的數據需要添加到新地圖中。

InvertedStemmerDB data = new InvertedStemmerDB(); 
    inDict = mapper.readValue(new File(dictionary), Map.class); 

    //Hold Stem Data... creating a whole new look-up dictionary for word endings 
    Map<String,Object> stemData = new HashMap<String,Object>(); 

    //Open up existing data 
    ObjectMapper mapper = new ObjectMapper(); 
    //Map<String,Object> data1 = mapper.readValue(new File("*****.json"), Map.class); 


    //Go through All the Data 
    for (Map.Entry<String, Object> entry : inDict.entrySet()) { 

     //this is how I'm stripping the word.. this isn't the issue 
     String key = entry.getKey(); 
     stemmer.setCurrent(key); 
     stemmer.stem(); 
     String stemKey = stemmer.getCurrent(); 
     String suffix = suffix(key, stemKey); 

     //get whats actually inside this word 
     Map<String, Integer> tags = (Map<String, Integer>) inDict.get(entry); 

     if (stemData.containsKey(suffix)) {//This means it needs to be updated, the stem already exists 

      //get object sub-value 
      Map<String, Integer> stemTag = (Map<String, Integer>) stemData.get(suffix); 

      double value = 0; 
      for (String tag : tags.keySet()) { 
       //add to stemData 
       if(stemTag.containsKey(tag)){ 
        int previousValue = stemTag.get(tag); 
        int resultantValue = tags.get(tag); 
        stemTag.put(tag, resultantValue+previousValue); 
       } 
       else 

       stemTag.put(tag, tags.get(tag)); 
      } 
     } 

     else { 
      //needs to be created, not updated 
       stemData.put(suffix, inDict.get(key)); 
      } 
    } 

    mapper.writeValue(new File("test_write.json"), stemData); 

後 '固定' 的幾個問題，我「米仍然得到一個NullPointerException ..

輸出示例：

因此，對於樣本數據：

"running": { 
    "ADJ": 1 
}, 
"dancing": { 
    "ADP": 28, 
    "ADV": 57 
}, 
"hopeing": { 
    "ADJ":14 
}, 

輸出成爲：

"ing": { 
    "ADJ": 15 
    "ADP": 28 
    "ADV": 57 

Answer 1

這裏是罪魁禍首：

//get whats actually inside this word 
Map<String, Integer> tags = (Map<String, Integer>) inDict.get(entry); 

它應該是：

Map<String, Integer> tags = (Map<String, Integer>) entry.getValue();